package zhr.chapter5.seven;

public class Example5_7 {
    public static void main(String[] args) {
     Printer hp = new Printer();
     USBStore seagate = new USBStore();
     Computer dell = new Computer();
     dell.workby(hp);
     dell.workby(seagate);

     Student mike = new Student();
     mike.turnOn(hp);
    }
}
